Tensile properties of concrete at very early ages

Nguyen, Duy Hieu; Dao, Vinh; Lura, Pietro

doi:10.1016/j.conbuildmat.2016.12.169

Cited by 58 publications

(24 citation statements)

References 18 publications

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“…Much larger compared to Østergaard's model, but shows good agreement with other studies [11,25,26] (Figure 8b).…”

Section:  T  1daysupporting

confidence: 91%

“…From the illustration in Figure 4, the inter-relationship between the two seems strongly dependent on concrete age and cement type, if not mentioned the effect of micro fibres in mix 2 (Figure 4a). -Concrete was reported to be more ductile during the first day of age, and the tail of the tensile softening curve was evidenced to be much longer compared to that at later age [11,25,26], leading to a considerable increase of the area under that curve (G F ). This explains relatively high fracture energy observed in mixes 1-4 before 10 hours of age.…”

Section: Tensile Strength F T -Fracture Energy G F Multi-linear Corrementioning

confidence: 99%

“…With no experimental data available, more assumptions and approximations are necessary, with the primary focus on the first 10 hours after placement. Equivalent experimental data, for comparison, are from mix 1 (recorded in this research program [26]) and mix 3 (from Dao et al [11]). Both bi-linear-and power models are considered.…”

Section:  T  1daymentioning

confidence: 99%

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A novel approach to estimate the evolution of fracture energy and tensile softening curve of concrete from very early age

Nguyen

Dao

2018

Engineering Fracture Mechanics

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Concrete fracture properties and their evolution over time are critical inputs for numerous engineering aspects. Despite substantial efforts invested, there exists a crucial need to establish a comprehensive model for reliable estimation of such evolution. In this paper, combining reliable experimental data and in-depth analyses, a novel approach for estimating of the evolution of fracture energy and tensile softening curve of concrete from early age is proposed. Fundamentally, the approach relies on three criteria, namely (i) Tensile strength, (ii) Tensile strength-fracture energy correlation and especially, (iii) Centroid coordinates of the area under actual stress-crack opening curve. Through detailed assessment of all mentioned criteria and with provided examples of direct applications, the capability and reliability of the approach are clearly demonstrated.

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“…Much larger compared to Østergaard's model, but shows good agreement with other studies [11,25,26] (Figure 8b).…”

Section:  T  1daysupporting

confidence: 91%

Section: Tensile Strength F T -Fracture Energy G F Multi-linear Corrementioning

confidence: 99%

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A novel approach to estimate the evolution of fracture energy and tensile softening curve of concrete from very early age

Nguyen

Dao

2018

Engineering Fracture Mechanics

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“…Uzorci oblika kosti korišteni su u ispitivanjima opisanim u [16,17,[25][26][27]. U ispitivanjima prema [12,13,[28][29][30][31] korišteni su uzorci prizmatičnog oblika, a u ispitivanjima prema [14,[32][33][34] uzorci cilindričnog oblika.…”

Section: Oblik Uzorkaunclassified

Direct tensile strength test of concrete

Renić¹,

Kišiček²

2018

4th Symposium on Doctoral Studies in Civil Engineering

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Vlačna čvrstoća i energija loma betona značajno utječu na ponašanje betonskih konstrukcija. Uobičajeno je koristiti neizravne metode ispitivanja, cijepanje i savijanje za određivanje vlačne čvrstoće betona. Neizravnim metodama nije moguće precizno procijeniti vlačno ponašanje betona. U radu je objašnjeno zašto su te metode neprikladne te je dan pregled preciznijih, izravnih metoda ispitivanja. Prikazane su prednosti i nedostaci svih metoda te opisani tehnički problemi pri ispitivanju. Nedostatak izravnog postupka ispitivanja je taj da još uvijek nije normiran.

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“…However, there is very limited relevant information available, especially on the direct measurement of the fracture energy or the complete tensile softening curves for early age concrete. This is mainly due to practical problems, for instance, very early age concrete specimens with a low degree of hydration cannot yet support their own weight without applying any loads [1,2]. Fracture properties, i.e., fracture toughness or fracture energy, have been reported through various types of indirect tensile tests: three-point bending tests [3][4][5], wedge splitting tests [6][7][8], and split tension tests [9,10].…”

Section: Introductionmentioning

confidence: 99%

Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen

Ren

Houben

2020

Materials

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Unlike the notched specimens for conventional concrete fracture tests, this paper introduces a deformation-controlled uniaxial tensile test on an un-notched specimen. The surface of the dog bone-shaped specimen is a second order parabolic curve, and the gradual change in the specimen shape does not lead to extreme stress concentrations. Another significant feature of the tension test set-up is that it is built with three hinges, to accommodate the alignment of the specimens. The specimen preparation, test conditions, and the tension test set-up are explained in detail. The fracture energy of the concrete is determined by the obtained complete softening curves. The fracture energy is found to increase with age, going towards a horizontal asymptote as concrete hardened in a tested age range of 1 day to 90 days. Moreover, the rate of development of the fracture energy was found to be higher when compared to tensile strength and stiffness.

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Tensile properties of concrete at very early ages

Cited by 58 publications

References 18 publications

A novel approach to estimate the evolution of fracture energy and tensile softening curve of concrete from very early age

A novel approach to estimate the evolution of fracture energy and tensile softening curve of concrete from very early age

Direct tensile strength test of concrete

Determination of Fracture Energy of Early Age Concrete through a Uniaxial Tensile Test on an Un-Notched Specimen

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